Iframe embed code

Presentation url

The Big Bang Theory * A small disclaimer: the Big Bang theory is taught as a theory. I am not trying to change your beliefs in any way. I am just simply stating some observations made by some really smart people!

Notes of Concern! It is believed that all matter and radiation was packed into a primeval fireball no larger then the period at the end of this sentence.
There was no “bang” or “explosion”, it is just a term.
Since there was no space prior, the big bang was more of an unfolding of space and matter from a very small region. Also time as we know it started.

What was created at the onset of the Big Bang?
Matter (Something that has mass and takes up space.)
Energy ( ex. Radiation /Light )
Time (A condition which has a past, present and future.)
Space (What the universe filled in.)

The first second In one-millionth of a second after the Big Bang, the Universe was a hot, seething mass of radiation and exotic particles.
This mass expanded and cooled, forming protons, neutrons and electrons (subatomic particles).

SO WHY DO SCIENTISTS BELIEVE THIS THEORY? The Big Bang is accepted because of three very persuasive pieces of evidence.
1. Red shift
2. The relative amounts of certain
chemical elements in the universe
3. The existence of cosmic radiation detected by microwave telescopes

Red shift cont… The red end of the spectrum has longer wavelengths, thus meaning the object is moving AWAY from the observer.
Example: When you hear an ambulance siren approaching, and then moving away.

2. Chemical Make-up Since, according to this theory, all matter was created at the Big Bang, the Universe today retains an imprint of its initial cosmic mixture.
Astronomers can analyze a star’s chemical make-up and the ratio of hydrogen to helium.
The amounts of these gases agree with what the Big Bang theory predicts.

3. Cosmic Background Radiation The last signs of heat left over from the Big Bang.
That original energy has cooled to -455F (a hundred million times cooler than a typical birthday candle!)
Can be detected by microwave wavelengths.

How will it end? The ultimate fate of our universe will be determined by the competition between the outward expansion:
(Momentum of matter),
and the inward pull of
gravity
(I’ve been told, in the end, gravity always wins)

The future of uncertainty There are several interesting scenarios, ranging from never ending expansion, to a contraction inward called the Big Crunch.
It all depends on the density of the Universe, and that depends on the amount of matter it contains.